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I have seen specs as high as 13 degrees but that seems a bit high to me. I would settle for something around eight degrees. That way you will be reasonably safe no matter what the other conditions are. This would be setting at an idle around 650 rpm. Its a good idea to rev the engine with the timing light attached and observe maximum advance it will likely go as high as 34 degrees total from about 2600 rpm to about 3400 max. You should never exceed a total timing of more than 38 degrees.
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